diff options
Diffstat (limited to 'drivers/media/sprd_scale/common/sin_cos.c')
| -rw-r--r-- | drivers/media/sprd_scale/common/sin_cos.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/media/sprd_scale/common/sin_cos.c b/drivers/media/sprd_scale/common/sin_cos.c new file mode 100644 index 00000000..57828254 --- /dev/null +++ b/drivers/media/sprd_scale/common/sin_cos.c @@ -0,0 +1,152 @@ +/* + * Copyright (C) 2012 Spreadtrum Communications Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include "sin_cos.h" +#define SINCOS_BIT_31 (1 << 31) +#define SINCOS_BIT_30 (1 << 30) +#define SMULL(x, y) ((int64_t)(x) * (int64_t)(y)) + +static const uint32_t cossin_tbl[64] = { + 0x3ffec42d, 0x00c90e90, 0x3ff4e5e0, 0x025b0caf, + 0x3fe12acb, 0x03ecadcf, 0x3fc395f9, 0x057db403, + 0x3f9c2bfb, 0x070de172, 0x3f6af2e3, 0x089cf867, + 0x3f2ff24a, 0x0a2abb59, 0x3eeb3347, 0x0bb6ecef, + 0x3e9cc076, 0x0d415013, 0x3e44a5ef, 0x0ec9a7f3, + 0x3de2f148, 0x104fb80e, 0x3d77b192, 0x11d3443f, + 0x3d02f757, 0x135410c3, 0x3c84d496, 0x14d1e242, + 0x3bfd5cc4, 0x164c7ddd, 0x3b6ca4c4, 0x17c3a931, + 0x3ad2c2e8, 0x19372a64, 0x3a2fcee8, 0x1aa6c82b, + 0x3983e1e8, 0x1c1249d8, 0x38cf1669, 0x1d79775c, + 0x3811884d, 0x1edc1953, 0x374b54ce, 0x2039f90f, + 0x367c9a7e, 0x2192e09b, 0x35a5793c, 0x22e69ac8, + 0x34c61236, 0x2434f332, 0x33de87de, 0x257db64c, + 0x32eefdea, 0x26c0b162, 0x31f79948, 0x27fdb2a7, + 0x30f8801f, 0x29348937, 0x2ff1d9c7, 0x2a650525, + 0x2ee3cebe, 0x2b8ef77d, 0x2dce88aa, 0x2cb2324c +}; + +static int32_t sin_core(int32_t arc_q33, int32_t sign) +{ + int32_t a, b, B; + int32_t sin_a, cos_a; + int32_t S1, S2, S3, S4, T1; + int32_t R = 0; + int32_t C1 = 0x6487ed51; + int32_t C2 = -715827882; + + a = arc_q33 >> 25; + cos_a = cossin_tbl[2 * a]; + sin_a = cossin_tbl[2 * a + 1]; + cos_a ^= (sign >> 31); + sin_a ^= (sign >> 31); + a = a << 25; + b = arc_q33 - a; + b -= (1 << 24); + B = SMULL((b << 3), C1) >> 32; + T1 = SMULL(B, B) >> 32; + S1 = sin_a; + S2 = SMULL(sin_a, T1 >> 1) >> 32; + S3 = SMULL(cos_a, B) >> 32; + S4 = SMULL(T1, C2) >> 32; + S4 = SMULL(S3, S4) >> 32; + R = S1 - S2 + S3 + S4; + return R; +} + +static int32_t cos_core(int32_t arc_q33, int32_t sign) +{ + int32_t a, b, B; + int32_t sin_a, cos_a; + int32_t S1, S2, S3, S4, T1; + int32_t R = 0; + int32_t C1 = 0x6487ed51; + int32_t C2 = 0x2aaaaaab; + + a = arc_q33 >> 25; + cos_a = cossin_tbl[a * 2]; + sin_a = cossin_tbl[a * 2 + 1]; + cos_a ^= (sign >> 31); + sin_a ^= (sign >> 31); + a = a << 25; + b = arc_q33 - a; + b -= (1 << 24); + B = SMULL((b << 3), C1) >> 32; + T1 = SMULL(B, B) >> 32; + S1 = cos_a; + S2 = SMULL(cos_a, T1 >> 1) >> 32; + S3 = SMULL(sin_a, B) >> 32; + S4 = SMULL(T1, C2) >> 32; + S4 = SMULL(S3, S4) >> 32; + R = S1 - S2 - S3 + S4; + return R; +} + +int32_t sin_32(int32_t n) +{ + int32_t s = n & SINCOS_BIT_31; + n = n << 1; + if (0 == n) { + return 0; + } + if (SINCOS_BIT_31 == (n & SINCOS_BIT_31)) { + n &= ~SINCOS_BIT_31; + if (n < SINCOS_BIT_30) { + return cos_core(n, s); + } else if (n == SINCOS_BIT_30) { + n -= 1; + } else if (n > SINCOS_BIT_30) { + n = SINCOS_BIT_31 - n; + } + return sin_core(n, s); + } else { + if (n < SINCOS_BIT_30) { + return sin_core(n, s); + } + if (n == SINCOS_BIT_30) { + n -= 1; + } else if (n > SINCOS_BIT_30) { + n = SINCOS_BIT_31 - n; + } + return cos_core(n, s); + } +} + +int32_t cos_32(int32_t n) +{ + int32_t s = n & SINCOS_BIT_31; + + n = n << 1; + if (n == SINCOS_BIT_31) { + return 0; + } + if (SINCOS_BIT_31 == (n & SINCOS_BIT_31)) { + n &= ~SINCOS_BIT_31; + if (n < SINCOS_BIT_30) { + return -sin_core(n, s); + } else if (n == SINCOS_BIT_30) { + n -= 1; + } else if (n > SINCOS_BIT_30) { + n = SINCOS_BIT_31 - n; + } + return -cos_core(n, s); + } else { + if (n < SINCOS_BIT_30) { + return cos_core(n, s); + } + if (n == SINCOS_BIT_30) { + n -= 1; + } else if (n > SINCOS_BIT_30) { + n = SINCOS_BIT_31 - n; + } + return sin_core(n, s); + } +} |